TB Wood's WFC1000 Series, Installation, Operation And Maintenance Instructions

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3.9 High Torque Set Up Procedure
The following procedure allows the WFC HT series AC inverter to be set up for low speed, high torque operation.
1. Program Parameter 51-VSEL to Data Code 6 (see page 30).
2. Program Parameter 65-SLIP per the formula on page 32.
3. Run the drive at 15 Hz setpoint and minimal loading (free shaft operation if possible). Enter Level 2
programming and scroll to parameter 5B-IMAG. ‘ADJ’ should appear in the lower left corner of display.
Press the ‘ENTER’ key on keypad to have the drive Auto-tune the 5B-IMAG value. The drive will measure
the magnetizing currents and place a value into parameter 5B-IMAG. Although not required, repeating the
process to verify consistent results is recommended.
Check the system for performance. For most applications, the above procedure is sufficient for ideal drive-
motor performance. For additional fine-tune adjustments, see the following steps.
1. Run the motor in the 2-6 Hz range. If the drive appears to draw excessive currents at low speeds with no
load, decrease the setting of 5B-IMAG. Too much 5B-IMAG can result in unstable motor operation.
2. Run the motor in the 2-6 Hz range under full load conditions. If the drive draws greater than motor name-
plate current, reduce the value of 52-BOOST. If it appears the motor is not developing sufficient torque,
increase the value to 52-BOOST. Note: For proper performance at frequencies below 6 Hz, inverter duty
motors are recommended. 52-BOOST is set at a value predetermined for premium efficiency motors.
When using inverter and vector duty motors, the value of 52-BOOST may need to be adjusted.
If additional problems arise, contact TB Wood’s Electronics Applications Engineering at 888-829-6637 for
assistance.
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